<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div 
                      class="button-wrapper" 
                      v-for="item of hot" 
                      :key="item.id"
                      @click="handleCityClick(item.name)">
                      <div class="button">{{item.name}}</div>
                    </div>
                </div>
            </div>
            <div 
              class="area" 
              v-for="(item, key) of cities"
              :key="key"
              :ref="key"
            >
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div 
                      class="item border-bottom"
                      v-for="innerItem of item"
                      :key="innerItem.id"
                      @click="handleCityClick(innerItem.name)"
                    >
                    {{innerItem.name}}
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
    name: 'CityList',
    props: {
        hot: Array,
        cities: Object,
        letter: String
    },
    computed: {
         ...mapState({
             currentCity: 'city'
       })
    },
    methods: {
      handleCityClick (city) {
        this.changeCity(city)
        this.$router.push('./')
      },
      ...mapMutations(['changeCity'])
    },
     updated () {
        this.scroll.refresh()
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.wrapper, {
          click: true
        })
    },
    watch: {
        letter () {
            if (this.letter) {
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    }
   
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list 
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background: #eeeeee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left 
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid  #ccc 
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>